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求下列函数的极值:1)u=x2+(y-1)2;2)u=(2ax-x2)(2by-y2),ab≠0;3)u=x
求下列函数的极值:1)u=x2+(y-1)2;2)u=(2ax-x2)(2by-y2),ab≠0;3)u=x
求下列函数的极值:
1)u=x2+(y-1)2;
2)u=(2ax-x2)(2by-y2),ab≠0;
3)u=x3+3xy2一15x-12y;
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求下列函数的极值:
1)u=x2+(y-1)2;
2)u=(2ax-x2)(2by-y2),ab≠0;
3)u=x3+3xy2一15x-12y;
已知[f(t)-]=F(s),m≥n,a>0,b≥0,试求下列函数的Laplace变换.
(1)tmf(n)(t);
(3)f(at—b)u(at—b).